curl --request GET \
  --url https://api.eflow.team/v1/affiliates/billings/affiliates/invoices/{invoiceId} \
  --header 'X-Eflow-Api-Key: <api-key>'

{
  "network_affiliate_invoice_id": 123,
  "affiliate_invoice_status": "<string>",
  "start_time": "2023-11-07T05:31:56Z",
  "end_time": "2023-11-07T05:31:56Z",
  "balance": 123,
  "billed": 123,
  "paid": 123,
  "payment_terms": "<string>",
  "currency_id": "<string>",
  "relationship": {
    "details": [
      {
        "type": "referral",
        "description": "<string>",
        "amount": 123,
        "network_offer_id": 123
      }
    ],
    "payments": [
      {
        "payment_type": "<string>",
        "amount": 123,
        "payment_date": "2023-11-07T05:31:56Z",
        "reference": "<string>"
      }
    ]
  }
}